<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			h1{
				width: 500px;
				height: 500px;
				margin: 0 auto;
				background-color: azure;
				text-align: center;
				line-height: 500px;
				box-shadow: 0 0 15px rgb(132, 229, 241);
				color: rgba(91, 236, 55, 0.616);
			}
		</style>
	</head>
	<body>
			<h1>
				<span>helloworld</span>		<!--默认仅继承文字相关属性-->
			</h1>
	</body>
</html>